Current File : //proc/985914/root/www/varak.net/wiki.varak.net/resources/src/startup/mediawiki.js
/**
* Base library for MediaWiki.
*
* Exposed globally as `mw`, with `mediaWiki` as alias.
*
* @class mw
* @alternateClassName mediaWiki
* @singleton
*/
/* global $VARS, $CODE */
( function () {
'use strict';
var mw, StringSet, log,
trackQueue = [];
/**
* FNV132 hash function
*
* This function implements the 32-bit version of FNV-1.
* It is equivalent to hash( 'fnv132', ... ) in PHP, except
* its output is base 36 rather than hex.
* See <https://en.wikipedia.org/wiki/FNV_hash_function>
*
* @private
* @param {string} str String to hash
* @return {string} hash as an seven-character base 36 string
*/
function fnv132( str ) {
/* eslint-disable no-bitwise */
var hash = 0x811C9DC5,
i;
for ( i = 0; i < str.length; i++ ) {
hash += ( hash << 1 ) + ( hash << 4 ) + ( hash << 7 ) + ( hash << 8 ) + ( hash << 24 );
hash ^= str.charCodeAt( i );
}
hash = ( hash >>> 0 ).toString( 36 );
while ( hash.length < 7 ) {
hash = '0' + hash;
}
return hash;
/* eslint-enable no-bitwise */
}
function defineFallbacks() {
// <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set>
/**
* @private
* @class
*/
StringSet = window.Set || function StringSet() {
var set = Object.create( null );
this.add = function ( value ) {
set[ value ] = true;
};
this.has = function ( value ) {
return value in set;
};
};
}
/**
* Alias property to the global object.
*
* @private
* @static
* @member mw.Map
* @param {mw.Map} map
* @param {string} key
* @param {Mixed} value
*/
function setGlobalMapValue( map, key, value ) {
map.values[ key ] = value;
log.deprecate(
window,
key,
value,
// Deprecation notice for mw.config globals (T58550, T72470)
map === mw.config && 'Use mw.config instead.'
);
}
/**
* Log a message to window.console, if possible.
*
* Useful to force logging of some errors that are otherwise hard to detect (i.e., this logs
* also in production mode). Gets console references in each invocation instead of caching the
* reference, so that debugging tools loaded later are supported (e.g. Firebug Lite in IE).
*
* @private
* @param {string} topic Stream name passed by mw.track
* @param {Object} data Data passed by mw.track
* @param {Error} [data.exception]
* @param {string} data.source Error source
* @param {string} [data.module] Name of module which caused the error
*/
function logError( topic, data ) {
/* eslint-disable no-console */
var msg,
e = data.exception,
source = data.source,
module = data.module,
console = window.console;
if ( console && console.log ) {
msg = ( e ? 'Exception' : 'Error' ) + ' in ' + source;
if ( module ) {
msg += ' in module ' + module;
}
msg += ( e ? ':' : '.' );
console.log( msg );
// If we have an exception object, log it to the warning channel to trigger
// proper stacktraces in browsers that support it.
if ( e && console.warn ) {
console.warn( e );
}
}
/* eslint-enable no-console */
}
/**
* Create an object that can be read from or written to via methods that allow
* interaction both with single and multiple properties at once.
*
* @private
* @class mw.Map
*
* @constructor
* @param {boolean} [global=false] Whether to synchronise =values to the global
* window object (for backwards-compatibility with mw.config; T72470). Values are
* copied in one direction only. Changes to globals do not reflect in the map.
*/
function Map( global ) {
this.values = Object.create( null );
if ( global === true ) {
// Override #set to also set the global variable
this.set = function ( selection, value ) {
var s;
if ( arguments.length > 1 ) {
if ( typeof selection !== 'string' ) {
return false;
}
setGlobalMapValue( this, selection, value );
return true;
}
if ( typeof selection === 'object' ) {
for ( s in selection ) {
setGlobalMapValue( this, s, selection[ s ] );
}
return true;
}
return false;
};
}
}
Map.prototype = {
constructor: Map,
/**
* Get the value of one or more keys.
*
* If called with no arguments, all values are returned.
*
* @param {string|Array} [selection] Key or array of keys to retrieve values for.
* @param {Mixed} [fallback=null] Value for keys that don't exist.
* @return {Mixed|Object|null} If selection was a string, returns the value,
* If selection was an array, returns an object of key/values.
* If no selection is passed, a new object with all key/values is returned.
*/
get: function ( selection, fallback ) {
var results, i;
fallback = arguments.length > 1 ? fallback : null;
if ( Array.isArray( selection ) ) {
results = {};
for ( i = 0; i < selection.length; i++ ) {
if ( typeof selection[ i ] === 'string' ) {
results[ selection[ i ] ] = selection[ i ] in this.values ?
this.values[ selection[ i ] ] :
fallback;
}
}
return results;
}
if ( typeof selection === 'string' ) {
return selection in this.values ?
this.values[ selection ] :
fallback;
}
if ( selection === undefined ) {
results = {};
for ( i in this.values ) {
results[ i ] = this.values[ i ];
}
return results;
}
// Invalid selection key
return fallback;
},
/**
* Set one or more key/value pairs.
*
* @param {string|Object} selection Key to set value for, or object mapping keys to values
* @param {Mixed} [value] Value to set (optional, only in use when key is a string)
* @return {boolean} True on success, false on failure
*/
set: function ( selection, value ) {
var s;
// Use `arguments.length` because `undefined` is also a valid value.
if ( arguments.length > 1 ) {
if ( typeof selection !== 'string' ) {
return false;
}
this.values[ selection ] = value;
return true;
}
if ( typeof selection === 'object' ) {
for ( s in selection ) {
this.values[ s ] = selection[ s ];
}
return true;
}
return false;
},
/**
* Check if one or more keys exist.
*
* @param {Mixed} selection Key or array of keys to check
* @return {boolean} True if the key(s) exist
*/
exists: function ( selection ) {
var i;
if ( Array.isArray( selection ) ) {
for ( i = 0; i < selection.length; i++ ) {
if ( typeof selection[ i ] !== 'string' || !( selection[ i ] in this.values ) ) {
return false;
}
}
return true;
}
return typeof selection === 'string' && selection in this.values;
}
};
defineFallbacks();
log = ( function () {
/**
* Write a verbose message to the browser's console in debug mode.
*
* This method is mainly intended for verbose logging. It is a no-op in production mode.
* In ResourceLoader debug mode, it will use the browser's console if available, with
* fallback to creating a console interface in the DOM and logging messages there.
*
* See {@link mw.log} for other logging methods.
*
* @member mw
* @param {...string} msg Messages to output to console.
*/
var log = function () {},
console = window.console;
// Note: Keep list of methods in sync with restoration in mediawiki.log.js
// when adding or removing mw.log methods below!
/**
* Collection of methods to help log messages to the console.
*
* @class mw.log
* @singleton
*/
/**
* Write a message to the browser console's warning channel.
*
* This method is a no-op in browsers that don't implement the Console API.
*
* @param {...string} msg Messages to output to console
*/
log.warn = console && console.warn ?
Function.prototype.bind.call( console.warn, console ) :
function () {};
/**
* Write a message to the browser console's error channel.
*
* Most browsers also print a stacktrace when calling this method if the
* argument is an Error object.
*
* This method is a no-op in browsers that don't implement the Console API.
*
* @since 1.26
* @param {...Mixed} msg Messages to output to console
*/
log.error = console && console.error ?
Function.prototype.bind.call( console.error, console ) :
function () {};
/**
* Create a property on a host object that, when accessed, will produce
* a deprecation warning in the console.
*
* @param {Object} obj Host object of deprecated property
* @param {string} key Name of property to create in `obj`
* @param {Mixed} val The value this property should return when accessed
* @param {string} [msg] Optional text to include in the deprecation message
* @param {string} [logName=key] Optional custom name for the feature.
* This is used instead of `key` in the message and `mw.deprecate` tracking.
*/
log.deprecate = function ( obj, key, val, msg, logName ) {
var stacks;
function maybeLog() {
var name,
trace = new Error().stack;
if ( !stacks ) {
stacks = new StringSet();
}
if ( !stacks.has( trace ) ) {
stacks.add( trace );
name = logName || key;
mw.track( 'mw.deprecate', name );
mw.log.warn(
'Use of "' + name + '" is deprecated.' + ( msg ? ( ' ' + msg ) : '' )
);
}
}
// Support: Safari 5.0
// Throws "not supported on DOM Objects" for Node or Element objects (incl. document)
// Safari 4.0 doesn't have this method, and it was fixed in Safari 5.1.
try {
Object.defineProperty( obj, key, {
configurable: true,
enumerable: true,
get: function () {
maybeLog();
return val;
},
set: function ( newVal ) {
maybeLog();
val = newVal;
}
} );
} catch ( err ) {
obj[ key ] = val;
}
};
return log;
}() );
/**
* @class mw
*/
mw = {
redefineFallbacksForTest: function () {
if ( !window.QUnit ) {
throw new Error( 'Reset not allowed outside unit tests' );
}
defineFallbacks();
},
/**
* Get the current time, measured in milliseconds since January 1, 1970 (UTC).
*
* On browsers that implement the Navigation Timing API, this function will produce
* floating-point values with microsecond precision that are guaranteed to be monotonic.
* On all other browsers, it will fall back to using `Date`.
*
* @return {number} Current time
*/
now: function () {
// Optimisation: Define the shortcut on first call, not at module definition.
var perf = window.performance,
navStart = perf && perf.timing && perf.timing.navigationStart;
// Define the relevant shortcut
mw.now = navStart && typeof perf.now === 'function' ?
function () { return navStart + perf.now(); } :
Date.now;
return mw.now();
},
/**
* List of all analytic events emitted so far.
*
* @private
* @property {Array}
*/
trackQueue: trackQueue,
track: function ( topic, data ) {
trackQueue.push( { topic: topic, timeStamp: mw.now(), data: data } );
// The base module extends this method to fire events here
},
/**
* Track an early error event via mw.track and send it to the window console.
*
* @private
* @param {string} topic Topic name
* @param {Object} data Data describing the event, encoded as an object; see mw#logError
*/
trackError: function ( topic, data ) {
mw.track( topic, data );
logError( topic, data );
},
// Expose Map constructor
Map: Map,
/**
* Map of configuration values.
*
* Check out [the complete list of configuration values](https://www.mediawiki.org/wiki/Manual:Interface/JavaScript#mw.config)
* on mediawiki.org.
*
* If `$wgLegacyJavaScriptGlobals` is true, this Map will add its values to the
* global `window` object.
*
* @property {mw.Map} config
*/
// Dummy placeholder later assigned in ResourceLoaderStartUpModule
config: null,
/**
* Empty object for third-party libraries, for cases where you don't
* want to add a new global, or the global is bad and needs containment
* or wrapping.
*
* @property
*/
libs: {},
/**
* Access container for deprecated functionality that can be moved from
* from their legacy location and attached to this object (e.g. a global
* function that is deprecated and as stop-gap can be exposed through here).
*
* This was reserved for future use but never ended up being used.
*
* @deprecated since 1.22 Let deprecated identifiers keep their original name
* and use mw.log#deprecate to create an access container for tracking.
* @property
*/
legacy: {},
/**
* Store for messages.
*
* @property {mw.Map}
*/
messages: new Map(),
/**
* Store for templates associated with a module.
*
* @property {mw.Map}
*/
templates: new Map(),
// Expose mw.log
log: log,
/**
* Client for ResourceLoader server end point.
*
* This client is in charge of maintaining the module registry and state
* machine, initiating network (batch) requests for loading modules, as
* well as dependency resolution and execution of source code.
*
* For more information, refer to
* <https://www.mediawiki.org/wiki/ResourceLoader/Features>
*
* @class mw.loader
* @singleton
*/
loader: ( function () {
/**
* Fired via mw.track on various resource loading errors.
*
* @event resourceloader_exception
* @param {Error|Mixed} e The error that was thrown. Almost always an Error
* object, but in theory module code could manually throw something else, and that
* might also end up here.
* @param {string} [module] Name of the module which caused the error. Omitted if the
* error is not module-related or the module cannot be easily identified due to
* batched handling.
* @param {string} source Source of the error. Possible values:
*
* - style: stylesheet error (only affects old IE where a special style loading method
* is used)
* - load-callback: exception thrown by user callback
* - module-execute: exception thrown by module code
* - resolve: failed to sort dependencies for a module in mw.loader.load
* - store-eval: could not evaluate module code cached in localStorage
* - store-localstorage-init: localStorage or JSON parse error in mw.loader.store.init
* - store-localstorage-json: JSON conversion error in mw.loader.store
* - store-localstorage-update: localStorage conversion error in mw.loader.store.
*/
/**
* Fired via mw.track on resource loading error conditions.
*
* @event resourceloader_assert
* @param {string} source Source of the error. Possible values:
*
* - bug-T59567: failed to cache script due to an Opera function -> string conversion
* bug; see <https://phabricator.wikimedia.org/T59567> for details
*/
/**
* Mapping of registered modules.
*
* See #implement and #execute for exact details on support for script, style and messages.
*
* Format:
*
* {
* 'moduleName': {
* // From mw.loader.register()
* 'version': '########' (hash)
* 'dependencies': ['required.foo', 'bar.also', ...]
* 'group': 'somegroup', (or) null
* 'source': 'local', (or) 'anotherwiki'
* 'skip': 'return !!window.Example', (or) null
* 'module': export Object
*
* // Set from execute() or mw.loader.state()
* 'state': 'registered', 'loaded', 'loading', 'ready', 'error', or 'missing'
*
* // Optionally added at run-time by mw.loader.implement()
* 'skipped': true
* 'script': closure, array of urls, or string
* 'style': { ... } (see #execute)
* 'messages': { 'key': 'value', ... }
* }
* }
*
* State machine:
*
* - `registered`:
* The module is known to the system but not yet required.
* Meta data is registered via mw.loader#register. Calls to that method are
* generated server-side by the startup module.
* - `loading`:
* The module was required through mw.loader (either directly or as dependency of
* another module). The client will fetch module contents from the server.
* The contents are then stashed in the registry via mw.loader#implement.
* - `loaded`:
* The module has been loaded from the server and stashed via mw.loader#implement.
* Once the module has no more dependencies in-flight, the module will be executed,
* controlled via #requestPropagation and #doPropagation.
* - `executing`:
* The module is being executed.
* - `ready`:
* The module has been successfully executed.
* - `error`:
* The module (or one of its dependencies) produced an error during execution.
* - `missing`:
* The module was registered client-side and requested, but the server denied knowledge
* of the module's existence.
*
* @property
* @private
*/
var registry = Object.create( null ),
// Mapping of sources, keyed by source-id, values are strings.
//
// Format:
//
// {
// 'sourceId': 'http://example.org/w/load.php'
// }
//
sources = Object.create( null ),
// For queueModuleScript()
handlingPendingRequests = false,
pendingRequests = [],
// List of modules to be loaded
queue = [],
/**
* List of callback jobs waiting for modules to be ready.
*
* Jobs are created by #enqueue() and run by #doPropagation().
* Typically when a job is created for a module, the job's dependencies contain
* both the required module and all its recursive dependencies.
*
* Format:
*
* {
* 'dependencies': [ module names ],
* 'ready': Function callback
* 'error': Function callback
* }
*
* @property {Object[]} jobs
* @private
*/
jobs = [],
// For #requestPropagation() and #doPropagation()
willPropagate = false,
errorModules = [],
/**
* @private
* @property {Array} baseModules
*/
baseModules = $VARS.baseModules,
/**
* For #addEmbeddedCSS() and #addLink()
*
* @private
* @property {HTMLElement|null} marker
*/
marker = document.querySelector( 'meta[name="ResourceLoaderDynamicStyles"]' ),
// For #addEmbeddedCSS()
nextCssBuffer,
rAF = window.requestAnimationFrame || setTimeout;
/**
* Create a new style element and add it to the DOM.
*
* @private
* @param {string} text CSS text
* @param {Node|null} [nextNode] The element where the style tag
* should be inserted before
* @return {HTMLElement} Reference to the created style element
*/
function newStyleTag( text, nextNode ) {
var el = document.createElement( 'style' );
el.appendChild( document.createTextNode( text ) );
if ( nextNode && nextNode.parentNode ) {
nextNode.parentNode.insertBefore( el, nextNode );
} else {
document.head.appendChild( el );
}
return el;
}
/**
* @private
* @param {Object} cssBuffer
*/
function flushCssBuffer( cssBuffer ) {
var i;
// Mark this object as inactive now so that further calls to addEmbeddedCSS() from
// the callbacks go to a new buffer instead of this one (T105973)
cssBuffer.active = false;
newStyleTag( cssBuffer.cssText, marker );
for ( i = 0; i < cssBuffer.callbacks.length; i++ ) {
cssBuffer.callbacks[ i ]();
}
}
/**
* Add a bit of CSS text to the current browser page.
*
* The creation and insertion of the `<style>` element is debounced for two reasons:
*
* - Performing the insertion before the next paint round via requestAnimationFrame
* avoids forced or wasted style recomputations, which are expensive in browsers.
* - Reduce how often new stylesheets are inserted by letting additional calls to this
* function accumulate into a buffer for at least one JavaScript tick. Modules are
* received from the server in batches, which means there is likely going to be many
* calls to this function in a row within the same tick / the same call stack.
* See also T47810.
*
* @private
* @param {string} cssText CSS text to be added in a `<style>` tag.
* @param {Function} callback Called after the insertion has occurred
*/
function addEmbeddedCSS( cssText, callback ) {
// Create a buffer if:
// - We don't have one yet.
// - The previous one is closed.
// - The next CSS chunk syntactically needs to be at the start of a stylesheet (T37562).
if ( !nextCssBuffer || nextCssBuffer.active === false || cssText.slice( 0, '@import'.length ) === '@import' ) {
nextCssBuffer = {
cssText: '',
callbacks: [],
active: null
};
}
// Linebreak for somewhat distinguishable sections
nextCssBuffer.cssText += '\n' + cssText;
nextCssBuffer.callbacks.push( callback );
if ( nextCssBuffer.active === null ) {
nextCssBuffer.active = true;
// The flushCssBuffer callback has its parameter bound by reference, which means
// 1) We can still extend the buffer from our object reference after this point.
// 2) We can safely re-assign the variable (not the object) to start a new buffer.
rAF( flushCssBuffer.bind( null, nextCssBuffer ) );
}
}
/**
* @private
* @param {Array} modules List of module names
* @return {string} Hash of concatenated version hashes.
*/
function getCombinedVersion( modules ) {
var hashes = modules.reduce( function ( result, module ) {
return result + registry[ module ].version;
}, '' );
return fnv132( hashes );
}
/**
* Determine whether all dependencies are in state 'ready', which means we may
* execute the module or job now.
*
* @private
* @param {Array} modules Names of modules to be checked
* @return {boolean} True if all modules are in state 'ready', false otherwise
*/
function allReady( modules ) {
var i;
for ( i = 0; i < modules.length; i++ ) {
if ( mw.loader.getState( modules[ i ] ) !== 'ready' ) {
return false;
}
}
return true;
}
/**
* Determine whether all direct and base dependencies are in state 'ready'
*
* @private
* @param {string} module Name of the module to be checked
* @return {boolean} True if all direct/base dependencies are in state 'ready'; false otherwise
*/
function allWithImplicitReady( module ) {
return allReady( registry[ module ].dependencies ) &&
( baseModules.indexOf( module ) !== -1 || allReady( baseModules ) );
}
/**
* Determine whether all dependencies are in state 'ready', which means we may
* execute the module or job now.
*
* @private
* @param {Array} modules Names of modules to be checked
* @return {boolean} True if no modules are in state 'error' or 'missing', false otherwise
*/
function anyFailed( modules ) {
var i, state;
for ( i = 0; i < modules.length; i++ ) {
state = mw.loader.getState( modules[ i ] );
if ( state === 'error' || state === 'missing' ) {
return true;
}
}
return false;
}
/**
* Handle propagation of module state changes and reactions to them.
*
* - When a module reaches a failure state, this should be propagated to
* modules that depend on the failed module.
* - When a module reaches a final state, pending job callbacks for the
* module from mw.loader.using() should be called.
* - When a module reaches the 'ready' state from #execute(), consider
* executing dependant modules now having their dependencies satisfied.
* - When a module reaches the 'loaded' state from mw.loader.implement,
* consider executing it, if it has no unsatisfied dependencies.
*
* @private
*/
function doPropagation() {
var errorModule, baseModuleError, module, i, failed, job,
didPropagate = true;
// Keep going until the last iteration performed no actions.
do {
didPropagate = false;
// Stage 1: Propagate failures
while ( errorModules.length ) {
errorModule = errorModules.shift();
baseModuleError = baseModules.indexOf( errorModule ) !== -1;
for ( module in registry ) {
if ( registry[ module ].state !== 'error' && registry[ module ].state !== 'missing' ) {
if ( baseModuleError && baseModules.indexOf( module ) === -1 ) {
// Propate error from base module to all regular (non-base) modules
registry[ module ].state = 'error';
didPropagate = true;
} else if ( registry[ module ].dependencies.indexOf( errorModule ) !== -1 ) {
// Propagate error from dependency to depending module
registry[ module ].state = 'error';
// .. and propagate it further
errorModules.push( module );
didPropagate = true;
}
}
}
}
// Stage 2: Execute 'loaded' modules with no unsatisfied dependencies
for ( module in registry ) {
if ( registry[ module ].state === 'loaded' && allWithImplicitReady( module ) ) {
// Recursively execute all dependent modules that were already loaded
// (waiting for execution) and no longer have unsatisfied dependencies.
// Base modules may have dependencies amongst eachother to ensure correct
// execution order. Regular modules wait for all base modules.
// eslint-disable-next-line no-use-before-define
execute( module );
didPropagate = true;
}
}
// Stage 3: Invoke job callbacks that are no longer blocked
for ( i = 0; i < jobs.length; i++ ) {
job = jobs[ i ];
failed = anyFailed( job.dependencies );
if ( failed || allReady( job.dependencies ) ) {
jobs.splice( i, 1 );
i -= 1;
try {
if ( failed && job.error ) {
job.error( new Error( 'Module has failed dependencies' ), job.dependencies );
} else if ( !failed && job.ready ) {
job.ready();
}
} catch ( e ) {
// A user-defined callback raised an exception.
// Swallow it to protect our state machine!
mw.trackError( 'resourceloader.exception', {
exception: e,
source: 'load-callback'
} );
}
didPropagate = true;
}
}
} while ( didPropagate );
willPropagate = false;
}
/**
* Request a (debounced) call to doPropagation().
*
* @private
*/
function requestPropagation() {
if ( willPropagate ) {
// Already scheduled, or, we're already in a doPropagation stack.
return;
}
willPropagate = true;
// Yield for two reasons:
// * Allow successive calls to mw.loader.implement() from the same
// load.php response, or from the same asyncEval() to be in the
// propagation batch.
// * Allow the browser to breathe between the reception of
// module source code and the execution of it.
//
// Use a high priority because the user may be waiting for interactions
// to start being possible. But, first provide a moment (up to 'timeout')
// for native input event handling (e.g. scrolling/typing/clicking).
mw.requestIdleCallback( doPropagation, { timeout: 1 } );
}
/**
* Update a module's state in the registry and make sure any neccesary
* propagation will occur. See #doPropagation for more about propagation.
* See #registry for more about how states are used.
*
* @private
* @param {string} module
* @param {string} state
*/
function setAndPropagate( module, state ) {
registry[ module ].state = state;
if ( state === 'loaded' || state === 'ready' || state === 'error' || state === 'missing' ) {
if ( state === 'ready' ) {
// Queue to later be synced to the local module store.
mw.loader.store.add( module );
} else if ( state === 'error' || state === 'missing' ) {
errorModules.push( module );
}
requestPropagation();
}
}
/**
* Resolve dependencies and detect circular references.
*
* @private
* @param {string} module Name of the top-level module whose dependencies shall be
* resolved and sorted.
* @param {Array} resolved Returns a topological sort of the given module and its
* dependencies, such that later modules depend on earlier modules. The array
* contains the module names. If the array contains already some module names,
* this function appends its result to the pre-existing array.
* @param {StringSet} [unresolved] Used to track the current dependency
* chain, and to report loops in the dependency graph.
* @throws {Error} If any unregistered module or a dependency loop is encountered
*/
function sortDependencies( module, resolved, unresolved ) {
var i, deps, skip;
if ( !( module in registry ) ) {
throw new Error( 'Unknown dependency: ' + module );
}
if ( registry[ module ].skip !== null ) {
// eslint-disable-next-line no-new-func
skip = new Function( registry[ module ].skip );
registry[ module ].skip = null;
if ( skip() ) {
registry[ module ].skipped = true;
registry[ module ].dependencies = [];
setAndPropagate( module, 'ready' );
return;
}
}
if ( resolved.indexOf( module ) !== -1 ) {
// Module already resolved; nothing to do
return;
}
// Create unresolved if not passed in
if ( !unresolved ) {
unresolved = new StringSet();
}
// Add base modules
if ( baseModules.indexOf( module ) === -1 ) {
baseModules.forEach( function ( baseModule ) {
if ( resolved.indexOf( baseModule ) === -1 ) {
resolved.push( baseModule );
}
} );
}
// Tracks down dependencies
deps = registry[ module ].dependencies;
unresolved.add( module );
for ( i = 0; i < deps.length; i++ ) {
if ( resolved.indexOf( deps[ i ] ) === -1 ) {
if ( unresolved.has( deps[ i ] ) ) {
throw new Error(
'Circular reference detected: ' + module + ' -> ' + deps[ i ]
);
}
sortDependencies( deps[ i ], resolved, unresolved );
}
}
resolved.push( module );
}
/**
* Get names of module that a module depends on, in their proper dependency order.
*
* @private
* @param {string[]} modules Array of string module names
* @return {Array} List of dependencies, including 'module'.
* @throws {Error} If an unregistered module or a dependency loop is encountered
*/
function resolve( modules ) {
var i, resolved = [];
for ( i = 0; i < modules.length; i++ ) {
sortDependencies( modules[ i ], resolved );
}
return resolved;
}
/**
* Like #resolve(), except it will silently ignore modules that
* are missing or have missing dependencies.
*
* @private
* @param {string[]} modules Array of string module names
* @return {Array} List of dependencies.
*/
function resolveStubbornly( modules ) {
var i, saved, resolved = [];
for ( i = 0; i < modules.length; i++ ) {
saved = resolved.slice();
try {
sortDependencies( modules[ i ], resolved );
} catch ( err ) {
// This module is unknown or has unknown dependencies.
// Undo any incomplete resolutions made and keep going.
resolved = saved;
mw.trackError( 'resourceloader.exception', {
exception: err,
source: 'resolve'
} );
}
}
return resolved;
}
/**
* Load and execute a script.
*
* @private
* @param {string} src URL to script, will be used as the src attribute in the script tag
* @param {Function} [callback] Callback to run after request resolution
*/
function addScript( src, callback ) {
var script = document.createElement( 'script' );
script.src = src;
script.onload = script.onerror = function () {
if ( script.parentNode ) {
script.parentNode.removeChild( script );
}
script = null;
if ( callback ) {
callback();
callback = null;
}
};
document.head.appendChild( script );
}
/**
* Queue the loading and execution of a script for a particular module.
*
* This does for debug mode what runScript() does for production.
*
* @private
* @param {string} src URL of the script
* @param {string} moduleName Name of currently executing module
* @param {Function} callback Callback to run after addScript() resolution
*/
function queueModuleScript( src, moduleName, callback ) {
pendingRequests.push( function () {
// Keep in sync with execute()/runScript().
if ( moduleName !== 'jquery' ) {
window.require = mw.loader.require;
window.module = registry[ moduleName ].module;
}
addScript( src, function () {
// 'module.exports' should not persist after the file is executed to
// avoid leakage to unrelated code. 'require' should be kept, however,
// as asynchronous access to 'require' is allowed and expected. (T144879)
delete window.module;
callback();
// Start the next one (if any)
if ( pendingRequests[ 0 ] ) {
pendingRequests.shift()();
} else {
handlingPendingRequests = false;
}
} );
} );
if ( !handlingPendingRequests && pendingRequests[ 0 ] ) {
handlingPendingRequests = true;
pendingRequests.shift()();
}
}
/**
* Utility function for execute()
*
* @ignore
* @param {string} [media] Media attribute
* @param {string} url URL
*/
function addLink( media, url ) {
var el = document.createElement( 'link' );
el.rel = 'stylesheet';
if ( media && media !== 'all' ) {
el.media = media;
}
// If you end up here from an IE exception "SCRIPT: Invalid property value.",
// see #addEmbeddedCSS, T33676, T43331, and T49277 for details.
el.href = url;
if ( marker && marker.parentNode ) {
marker.parentNode.insertBefore( el, marker );
} else {
document.head.appendChild( el );
}
}
/**
* @private
* @param {string} code JavaScript code
*/
function domEval( code ) {
var script = document.createElement( 'script' );
if ( mw.config.get( 'wgCSPNonce' ) !== false ) {
script.nonce = mw.config.get( 'wgCSPNonce' );
}
script.text = code;
document.head.appendChild( script );
script.parentNode.removeChild( script );
}
/**
* Add one or more modules to the module load queue.
*
* See also #work().
*
* @private
* @param {string[]} dependencies Array of module names in the registry
* @param {Function} [ready] Callback to execute when all dependencies are ready
* @param {Function} [error] Callback to execute when any dependency fails
*/
function enqueue( dependencies, ready, error ) {
if ( allReady( dependencies ) ) {
// Run ready immediately
if ( ready !== undefined ) {
ready();
}
return;
}
if ( anyFailed( dependencies ) ) {
if ( error !== undefined ) {
// Execute error immediately if any dependencies have errors
error(
new Error( 'One or more dependencies failed to load' ),
dependencies
);
}
return;
}
// Not all dependencies are ready, add to the load queue...
// Add ready and error callbacks if they were given
if ( ready !== undefined || error !== undefined ) {
jobs.push( {
// Narrow down the list to modules that are worth waiting for
dependencies: dependencies.filter( function ( module ) {
var state = registry[ module ].state;
return state === 'registered' || state === 'loaded' || state === 'loading' || state === 'executing';
} ),
ready: ready,
error: error
} );
}
dependencies.forEach( function ( module ) {
// Only queue modules that are still in the initial 'registered' state
// (not ones already loading, ready or error).
if ( registry[ module ].state === 'registered' && queue.indexOf( module ) === -1 ) {
// Private modules must be embedded in the page. Don't bother queuing
// these as the server will deny them anyway (T101806).
if ( registry[ module ].group === 'private' ) {
setAndPropagate( module, 'error' );
return;
}
queue.push( module );
}
} );
mw.loader.work();
}
/**
* Executes a loaded module, making it ready to use
*
* @private
* @param {string} module Module name to execute
*/
function execute( module ) {
var key, value, media, i, urls, cssHandle, siteDeps, siteDepErr, runScript,
cssPending = 0;
if ( registry[ module ].state !== 'loaded' ) {
throw new Error( 'Module in state "' + registry[ module ].state + '" may not be executed: ' + module );
}
registry[ module ].state = 'executing';
$CODE.profileExecuteStart();
runScript = function () {
var script, markModuleReady, nestedAddScript;
$CODE.profileScriptStart();
script = registry[ module ].script;
markModuleReady = function () {
$CODE.profileScriptEnd();
setAndPropagate( module, 'ready' );
};
nestedAddScript = function ( arr, callback, i ) {
// Recursively call queueModuleScript() in its own callback
// for each element of arr.
if ( i >= arr.length ) {
// We're at the end of the array
callback();
return;
}
queueModuleScript( arr[ i ], module, function () {
nestedAddScript( arr, callback, i + 1 );
} );
};
try {
if ( Array.isArray( script ) ) {
nestedAddScript( script, markModuleReady, 0 );
} else if ( typeof script === 'function' ) {
// Keep in sync with queueModuleScript() for debug mode
if ( module === 'jquery' ) {
// This is a special case for when 'jquery' itself is being loaded.
// - The standard jquery.js distribution does not set `window.jQuery`
// in CommonJS-compatible environments (Node.js, AMD, RequireJS, etc.).
// - MediaWiki's 'jquery' module also bundles jquery.migrate.js, which
// in a CommonJS-compatible environment, will use require('jquery'),
// but that can't work when we're still inside that module.
script();
} else {
// Pass jQuery twice so that the signature of the closure which wraps
// the script can bind both '$' and 'jQuery'.
script( window.$, window.$, mw.loader.require, registry[ module ].module );
}
markModuleReady();
} else if ( typeof script === 'string' ) {
// Site and user modules are legacy scripts that run in the global scope.
// This is transported as a string instead of a function to avoid needing
// to use string manipulation to undo the function wrapper.
domEval( script );
markModuleReady();
} else {
// Module without script
markModuleReady();
}
} catch ( e ) {
// Use mw.track instead of mw.log because these errors are common in production mode
// (e.g. undefined variable), and mw.log is only enabled in debug mode.
setAndPropagate( module, 'error' );
$CODE.profileScriptEnd();
mw.trackError( 'resourceloader.exception', {
exception: e,
module: module,
source: 'module-execute'
} );
}
};
// Add localizations to message system
if ( registry[ module ].messages ) {
mw.messages.set( registry[ module ].messages );
}
// Initialise templates
if ( registry[ module ].templates ) {
mw.templates.set( module, registry[ module ].templates );
}
// Adding of stylesheets is asynchronous via addEmbeddedCSS().
// The below function uses a counting semaphore to make sure we don't call
// runScript() until after this module's stylesheets have been inserted
// into the DOM.
cssHandle = function () {
// Increase semaphore, when creating a callback for addEmbeddedCSS.
cssPending++;
return function () {
var runScriptCopy;
// Decrease semaphore, when said callback is invoked.
cssPending--;
if ( cssPending === 0 ) {
// Paranoia:
// This callback is exposed to addEmbeddedCSS, which is outside the execute()
// function and is not concerned with state-machine integrity. In turn,
// addEmbeddedCSS() actually exposes stuff further into the browser (rAF).
// If increment and decrement callbacks happen in the wrong order, or start
// again afterwards, then this branch could be reached multiple times.
// To protect the integrity of the state-machine, prevent that from happening
// by making runScript() cannot be called more than once. We store a private
// reference when we first reach this branch, then deference the original, and
// call our reference to it.
runScriptCopy = runScript;
runScript = undefined;
runScriptCopy();
}
};
};
// Process styles (see also mw.loader.implement)
// * back-compat: { <media>: css }
// * back-compat: { <media>: [url, ..] }
// * { "css": [css, ..] }
// * { "url": { <media>: [url, ..] } }
if ( registry[ module ].style ) {
for ( key in registry[ module ].style ) {
value = registry[ module ].style[ key ];
media = undefined;
if ( key !== 'url' && key !== 'css' ) {
// Backwards compatibility, key is a media-type
if ( typeof value === 'string' ) {
// back-compat: { <media>: css }
// Ignore 'media' because it isn't supported (nor was it used).
// Strings are pre-wrapped in "@media". The media-type was just ""
// (because it had to be set to something).
// This is one of the reasons why this format is no longer used.
addEmbeddedCSS( value, cssHandle() );
} else {
// back-compat: { <media>: [url, ..] }
media = key;
key = 'bc-url';
}
}
// Array of css strings in key 'css',
// or back-compat array of urls from media-type
if ( Array.isArray( value ) ) {
for ( i = 0; i < value.length; i++ ) {
if ( key === 'bc-url' ) {
// back-compat: { <media>: [url, ..] }
addLink( media, value[ i ] );
} else if ( key === 'css' ) {
// { "css": [css, ..] }
addEmbeddedCSS( value[ i ], cssHandle() );
}
}
// Not an array, but a regular object
// Array of urls inside media-type key
} else if ( typeof value === 'object' ) {
// { "url": { <media>: [url, ..] } }
for ( media in value ) {
urls = value[ media ];
for ( i = 0; i < urls.length; i++ ) {
addLink( media, urls[ i ] );
}
}
}
}
}
// End profiling of execute()-self before we call runScript(),
// which we want to measure separately without overlap.
$CODE.profileExecuteEnd();
if ( module === 'user' ) {
// Implicit dependency on the site module. Not a real dependency because it should
// run after 'site' regardless of whether it succeeds or fails.
// Note: This is a simplified version of mw.loader.using(), inlined here because
// mw.loader.using() is part of mediawiki.base (depends on jQuery; T192623).
try {
siteDeps = resolve( [ 'site' ] );
} catch ( e ) {
siteDepErr = e;
runScript();
}
if ( siteDepErr === undefined ) {
enqueue( siteDeps, runScript, runScript );
}
} else if ( cssPending === 0 ) {
// Regular module without styles
runScript();
}
// else: runScript will get called via cssHandle()
}
function sortQuery( o ) {
var key,
sorted = {},
a = [];
for ( key in o ) {
a.push( key );
}
a.sort();
for ( key = 0; key < a.length; key++ ) {
sorted[ a[ key ] ] = o[ a[ key ] ];
}
return sorted;
}
/**
* Converts a module map of the form `{ foo: [ 'bar', 'baz' ], bar: [ 'baz, 'quux' ] }`
* to a query string of the form `foo.bar,baz|bar.baz,quux`.
*
* See `ResourceLoader::makePackedModulesString()` in PHP, of which this is a port.
* On the server, unpacking is done by `ResourceLoaderContext::expandModuleNames()`.
*
* Note: This is only half of the logic, the other half has to be in #batchRequest(),
* because its implementation needs to keep track of potential string size in order
* to decide when to split the requests due to url size.
*
* @private
* @param {Object} moduleMap Module map
* @return {Object}
* @return {string} return.str Module query string
* @return {Array} return.list List of module names in matching order
*/
function buildModulesString( moduleMap ) {
var p, prefix,
str = [],
list = [];
function restore( suffix ) {
return p + suffix;
}
for ( prefix in moduleMap ) {
p = prefix === '' ? '' : prefix + '.';
str.push( p + moduleMap[ prefix ].join( ',' ) );
list.push.apply( list, moduleMap[ prefix ].map( restore ) );
}
return {
str: str.join( '|' ),
list: list
};
}
/**
* Resolve indexed dependencies.
*
* ResourceLoader uses an optimisation to save space which replaces module names in
* dependency lists with the index of that module within the array of module
* registration data if it exists. The benefit is a significant reduction in the data
* size of the startup module. This function changes those dependency lists back to
* arrays of strings.
*
* @private
* @param {Array} modules Modules array
*/
function resolveIndexedDependencies( modules ) {
var i, j, deps;
function resolveIndex( dep ) {
return typeof dep === 'number' ? modules[ dep ][ 0 ] : dep;
}
for ( i = 0; i < modules.length; i++ ) {
deps = modules[ i ][ 2 ];
if ( deps ) {
for ( j = 0; j < deps.length; j++ ) {
deps[ j ] = resolveIndex( deps[ j ] );
}
}
}
}
/**
* @private
* @param {Object} params Map of parameter names to values
* @return {string}
*/
function makeQueryString( params ) {
return Object.keys( params ).map( function ( key ) {
return encodeURIComponent( key ) + '=' + encodeURIComponent( params[ key ] );
} ).join( '&' );
}
/**
* Create network requests for a batch of modules.
*
* This is an internal method for #work(). This must not be called directly
* unless the modules are already registered, and no request is in progress,
* and the module state has already been set to `loading`.
*
* @private
* @param {string[]} batch
*/
function batchRequest( batch ) {
var reqBase, splits, maxQueryLength, b, bSource, bGroup,
source, group, i, modules, sourceLoadScript,
currReqBase, currReqBaseLength, moduleMap, currReqModules, l,
lastDotIndex, prefix, suffix, bytesAdded;
/**
* Start the currently drafted request to the server.
*
* @ignore
*/
function doRequest() {
// Optimisation: Inherit (Object.create), not copy ($.extend)
var query = Object.create( currReqBase ),
packed = buildModulesString( moduleMap );
query.modules = packed.str;
// The packing logic can change the effective order, even if the input was
// sorted. As such, the call to getCombinedVersion() must use this
// effective order, instead of currReqModules, as otherwise the combined
// version will not match the hash expected by the server based on
// combining versions from the module query string in-order. (T188076)
query.version = getCombinedVersion( packed.list );
query = sortQuery( query );
addScript( sourceLoadScript + '?' + makeQueryString( query ) );
}
if ( !batch.length ) {
return;
}
// Always order modules alphabetically to help reduce cache
// misses for otherwise identical content.
batch.sort();
// Query parameters common to all requests
reqBase = {
skin: mw.config.get( 'skin' ),
lang: mw.config.get( 'wgUserLanguage' ),
debug: mw.config.get( 'debug' )
};
maxQueryLength = mw.config.get( 'wgResourceLoaderMaxQueryLength', 2000 );
// Split module list by source and by group.
splits = Object.create( null );
for ( b = 0; b < batch.length; b++ ) {
bSource = registry[ batch[ b ] ].source;
bGroup = registry[ batch[ b ] ].group;
if ( !splits[ bSource ] ) {
splits[ bSource ] = Object.create( null );
}
if ( !splits[ bSource ][ bGroup ] ) {
splits[ bSource ][ bGroup ] = [];
}
splits[ bSource ][ bGroup ].push( batch[ b ] );
}
for ( source in splits ) {
sourceLoadScript = sources[ source ];
for ( group in splits[ source ] ) {
// Cache access to currently selected list of
// modules for this group from this source.
modules = splits[ source ][ group ];
// Query parameters common to requests for this module group
// Optimisation: Inherit (Object.create), not copy ($.extend)
currReqBase = Object.create( reqBase );
// User modules require a user name in the query string.
if ( group === 'user' && mw.config.get( 'wgUserName' ) !== null ) {
currReqBase.user = mw.config.get( 'wgUserName' );
}
// In addition to currReqBase, doRequest() will also add 'modules' and 'version'.
// > '&modules='.length === 9
// > '&version=1234567'.length === 16
// > 9 + 16 = 25
currReqBaseLength = makeQueryString( currReqBase ).length + 25;
// We may need to split up the request to honor the query string length limit,
// so build it piece by piece.
l = currReqBaseLength;
moduleMap = Object.create( null ); // { prefix: [ suffixes ] }
currReqModules = [];
for ( i = 0; i < modules.length; i++ ) {
// Determine how many bytes this module would add to the query string
lastDotIndex = modules[ i ].lastIndexOf( '.' );
// If lastDotIndex is -1, substr() returns an empty string
prefix = modules[ i ].substr( 0, lastDotIndex );
suffix = modules[ i ].slice( lastDotIndex + 1 );
bytesAdded = moduleMap[ prefix ] ?
suffix.length + 3 : // '%2C'.length == 3
modules[ i ].length + 3; // '%7C'.length == 3
// If the url would become too long, create a new one, but don't create empty requests
if ( maxQueryLength > 0 && currReqModules.length && l + bytesAdded > maxQueryLength ) {
// Dispatch what we've got...
doRequest();
// .. and start again.
l = currReqBaseLength;
moduleMap = Object.create( null );
currReqModules = [];
mw.track( 'resourceloader.splitRequest', { maxQueryLength: maxQueryLength } );
}
if ( !moduleMap[ prefix ] ) {
moduleMap[ prefix ] = [];
}
l += bytesAdded;
moduleMap[ prefix ].push( suffix );
currReqModules.push( modules[ i ] );
}
// If there's anything left in moduleMap, request that too
if ( currReqModules.length ) {
doRequest();
}
}
}
}
/**
* @private
* @param {string[]} implementations Array containing pieces of JavaScript code in the
* form of calls to mw.loader#implement().
* @param {Function} cb Callback in case of failure
* @param {Error} cb.err
*/
function asyncEval( implementations, cb ) {
if ( !implementations.length ) {
return;
}
mw.requestIdleCallback( function () {
try {
domEval( implementations.join( ';' ) );
} catch ( err ) {
cb( err );
}
} );
}
/**
* Make a versioned key for a specific module.
*
* @private
* @param {string} module Module name
* @return {string|null} Module key in format '`[name]@[version]`',
* or null if the module does not exist
*/
function getModuleKey( module ) {
return module in registry ? ( module + '@' + registry[ module ].version ) : null;
}
/**
* @private
* @param {string} key Module name or '`[name]@[version]`'
* @return {Object}
*/
function splitModuleKey( key ) {
var index = key.indexOf( '@' );
if ( index === -1 ) {
return {
name: key,
version: ''
};
}
return {
name: key.slice( 0, index ),
version: key.slice( index + 1 )
};
}
/**
* @private
* @param {string} module
* @param {string|number} [version]
* @param {string[]} [dependencies]
* @param {string} [group]
* @param {string} [source]
* @param {string} [skip]
*/
function registerOne( module, version, dependencies, group, source, skip ) {
if ( module in registry ) {
throw new Error( 'module already registered: ' + module );
}
registry[ module ] = {
// Exposed to execute() for mw.loader.implement() closures.
// Import happens via require().
module: {
exports: {}
},
version: String( version || '' ),
dependencies: dependencies || [],
group: typeof group === 'string' ? group : null,
source: typeof source === 'string' ? source : 'local',
state: 'registered',
skip: typeof skip === 'string' ? skip : null
};
}
/* Public Members */
return {
/**
* The module registry is exposed as an aid for debugging and inspecting page
* state; it is not a public interface for modifying the registry.
*
* @see #registry
* @property
* @private
*/
moduleRegistry: registry,
/**
* @inheritdoc #newStyleTag
* @method
*/
addStyleTag: newStyleTag,
enqueue: enqueue,
resolve: resolve,
/**
* Start loading of all queued module dependencies.
*
* @private
*/
work: function () {
var q, batch, implementations, sourceModules;
batch = [];
// Appends a list of modules from the queue to the batch
for ( q = 0; q < queue.length; q++ ) {
// Only load modules which are registered
if ( queue[ q ] in registry && registry[ queue[ q ] ].state === 'registered' ) {
// Prevent duplicate entries
if ( batch.indexOf( queue[ q ] ) === -1 ) {
batch.push( queue[ q ] );
// Mark registered modules as loading
registry[ queue[ q ] ].state = 'loading';
}
}
}
// Now that the queue has been processed into a batch, clear the queue.
// This MUST happen before we initiate any eval or network request. Otherwise,
// it is possible for a cached script to instantly trigger the same work queue
// again; all before we've cleared it causing each request to include modules
// which are already loaded.
queue = [];
if ( !batch.length ) {
return;
}
mw.loader.store.init();
if ( mw.loader.store.enabled ) {
implementations = [];
sourceModules = [];
batch = batch.filter( function ( module ) {
var implementation = mw.loader.store.get( module );
if ( implementation ) {
implementations.push( implementation );
sourceModules.push( module );
return false;
}
return true;
} );
asyncEval( implementations, function ( err ) {
var failed;
// Not good, the cached mw.loader.implement calls failed! This should
// never happen, barring ResourceLoader bugs, browser bugs and PEBKACs.
// Depending on how corrupt the string is, it is likely that some
// modules' implement() succeeded while the ones after the error will
// never run and leave their modules in the 'loading' state forever.
mw.loader.store.stats.failed++;
// Since this is an error not caused by an individual module but by
// something that infected the implement call itself, don't take any
// risks and clear everything in this cache.
mw.loader.store.clear();
mw.trackError( 'resourceloader.exception', {
exception: err,
source: 'store-eval'
} );
// Re-add the failed ones that are still pending back to the batch
failed = sourceModules.filter( function ( module ) {
return registry[ module ].state === 'loading';
} );
batchRequest( failed );
} );
}
batchRequest( batch );
},
/**
* Register a source.
*
* The #work() method will use this information to split up requests by source.
*
* mw.loader.addSource( { mediawikiwiki: 'https://www.mediawiki.org/w/load.php' } );
*
* @private
* @param {Object} ids An object mapping ids to load.php end point urls
* @throws {Error} If source id is already registered
*/
addSource: function ( ids ) {
var id;
for ( id in ids ) {
if ( id in sources ) {
throw new Error( 'source already registered: ' + id );
}
sources[ id ] = ids[ id ];
}
},
/**
* Register a module, letting the system know about it and its properties.
*
* The startup module calls this method.
*
* When using multiple module registration by passing an array, dependencies that
* are specified as references to modules within the array will be resolved before
* the modules are registered.
*
* @param {string|Array} modules Module name or array of arrays, each containing
* a list of arguments compatible with this method
* @param {string|number} [version] Module version hash (falls backs to empty string)
* Can also be a number (timestamp) for compatibility with MediaWiki 1.25 and earlier.
* @param {string[]} [dependencies] Array of module names on which this module depends.
* @param {string} [group=null] Group which the module is in
* @param {string} [source='local'] Name of the source
* @param {string} [skip=null] Script body of the skip function
*/
register: function ( modules ) {
var i;
if ( typeof modules === 'object' ) {
resolveIndexedDependencies( modules );
// Optimisation: Up to 55% faster.
// Typically called only once, and with a batch.
// See <https://gist.github.com/Krinkle/f06fdb3de62824c6c16f02a0e6ce0e66>
// Benchmarks taught us that the code for adding an object to `registry`
// should actually be inline, or in a simple function that does no
// arguments manipulation, and isn't also the caller itself.
// JS semantics make it hard to optimise recursion to a different
// signature of itself.
for ( i = 0; i < modules.length; i++ ) {
registerOne.apply( null, modules[ i ] );
}
} else {
registerOne.apply( null, arguments );
}
},
/**
* Implement a module given the components that make up the module.
*
* When #load() or #using() requests one or more modules, the server
* response contain calls to this function.
*
* @param {string} module Name of module and current module version. Formatted
* as '`[name]@[version]`". This version should match the requested version
* (from #batchRequest and #registry). This avoids race conditions (T117587).
* For back-compat with MediaWiki 1.27 and earlier, the version may be omitted.
* @param {Function|Array|string} [script] Function with module code, list of URLs
* to load via `<script src>`, or string of module code for `$.globalEval()`.
* @param {Object} [style] Should follow one of the following patterns:
*
* { "css": [css, ..] }
* { "url": { <media>: [url, ..] } }
*
* And for backwards compatibility (needs to be supported forever due to caching):
*
* { <media>: css }
* { <media>: [url, ..] }
*
* The reason css strings are not concatenated anymore is T33676. We now check
* whether it's safe to extend the stylesheet.
*
* @private
* @param {Object} [messages] List of key/value pairs to be added to mw#messages.
* @param {Object} [templates] List of key/value pairs to be added to mw#templates.
*/
implement: function ( module, script, style, messages, templates ) {
var split = splitModuleKey( module ),
name = split.name,
version = split.version;
// Automatically register module
if ( !( name in registry ) ) {
mw.loader.register( name );
}
// Check for duplicate implementation
if ( registry[ name ].script !== undefined ) {
throw new Error( 'module already implemented: ' + name );
}
if ( version ) {
// Without this reset, if there is a version mismatch between the
// requested and received module version, then mw.loader.store would
// cache the response under the requested key. Thus poisoning the cache
// indefinitely with a stale value. (T117587)
registry[ name ].version = version;
}
// Attach components
registry[ name ].script = script || null;
registry[ name ].style = style || null;
registry[ name ].messages = messages || null;
registry[ name ].templates = templates || null;
// The module may already have been marked as erroneous
if ( registry[ name ].state !== 'error' && registry[ name ].state !== 'missing' ) {
setAndPropagate( name, 'loaded' );
}
},
/**
* Load an external script or one or more modules.
*
* This method takes a list of unrelated modules. Use cases:
*
* - A web page will be composed of many different widgets. These widgets independently
* queue their ResourceLoader modules (`OutputPage::addModules()`). If any of them
* have problems, or are no longer known (e.g. cached HTML), the other modules
* should still be loaded.
* - This method is used for preloading, which must not throw. Later code that
* calls #using() will handle the error.
*
* @param {string|Array} modules Either the name of a module, array of modules,
* or a URL of an external script or style
* @param {string} [type='text/javascript'] MIME type to use if calling with a URL of an
* external script or style; acceptable values are "text/css" and
* "text/javascript"; if no type is provided, text/javascript is assumed.
*/
load: function ( modules, type ) {
var filtered, l;
// Allow calling with a url or single dependency as a string
if ( typeof modules === 'string' ) {
// "https://example.org/x.js", "http://example.org/x.js", "//example.org/x.js", "/x.js"
if ( /^(https?:)?\/?\//.test( modules ) ) {
if ( type === 'text/css' ) {
l = document.createElement( 'link' );
l.rel = 'stylesheet';
l.href = modules;
document.head.appendChild( l );
return;
}
if ( type === 'text/javascript' || type === undefined ) {
addScript( modules );
return;
}
// Unknown type
throw new Error( 'invalid type for external url, must be text/css or text/javascript. not ' + type );
}
// Called with single module
modules = [ modules ];
}
// Filter out top-level modules that are unknown or failed to load before.
filtered = modules.filter( function ( module ) {
var state = mw.loader.getState( module );
return state !== 'error' && state !== 'missing';
} );
// Resolve remaining list using the known dependency tree.
// This also filters out modules with unknown dependencies. (T36853)
filtered = resolveStubbornly( filtered );
// Some modules are not yet ready, add to module load queue.
enqueue( filtered, undefined, undefined );
},
/**
* Change the state of one or more modules.
*
* @param {Object} states Object of module name/state pairs
*/
state: function ( states ) {
var module, state;
for ( module in states ) {
state = states[ module ];
if ( !( module in registry ) ) {
mw.loader.register( module );
}
setAndPropagate( module, state );
}
},
/**
* Get the version of a module.
*
* @param {string} module Name of module
* @return {string|null} The version, or null if the module (or its version) is not
* in the registry.
*/
getVersion: function ( module ) {
return module in registry ? registry[ module ].version : null;
},
/**
* Get the state of a module.
*
* @param {string} module Name of module
* @return {string|null} The state, or null if the module (or its state) is not
* in the registry.
*/
getState: function ( module ) {
return module in registry ? registry[ module ].state : null;
},
/**
* Get the names of all registered modules.
*
* @return {Array}
*/
getModuleNames: function () {
return Object.keys( registry );
},
/**
* Get the exported value of a module.
*
* This static method is publicly exposed for debugging purposes
* only and must not be used in production code. In production code,
* please use the dynamically provided `require()` function instead.
*
* In case of lazy-loaded modules via mw.loader#using(), the returned
* Promise provides the function, see #using() for examples.
*
* @private
* @since 1.27
* @param {string} moduleName Module name
* @return {Mixed} Exported value
*/
require: function ( moduleName ) {
var state = mw.loader.getState( moduleName );
// Only ready modules can be required
if ( state !== 'ready' ) {
// Module may've forgotten to declare a dependency
throw new Error( 'Module "' + moduleName + '" is not loaded.' );
}
return registry[ moduleName ].module.exports;
},
/**
* On browsers that implement the localStorage API, the module store serves as a
* smart complement to the browser cache. Unlike the browser cache, the module store
* can slice a concatenated response from ResourceLoader into its constituent
* modules and cache each of them separately, using each module's versioning scheme
* to determine when the cache should be invalidated.
*
* @private
* @singleton
* @class mw.loader.store
*/
store: {
// Whether the store is in use on this page.
enabled: null,
// Modules whose string representation exceeds 100 kB are
// ineligible for storage. See bug T66721.
MODULE_SIZE_MAX: 100 * 1000,
// The contents of the store, mapping '[name]@[version]' keys
// to module implementations.
items: {},
// Names of modules to be stored during the next update.
// See add() and update().
queue: [],
// Cache hit stats
stats: { hits: 0, misses: 0, expired: 0, failed: 0 },
/**
* Construct a JSON-serializable object representing the content of the store.
*
* @return {Object} Module store contents.
*/
toJSON: function () {
return { items: mw.loader.store.items, vary: mw.loader.store.getVary() };
},
/**
* Get the localStorage key for the entire module store. The key references
* $wgDBname to prevent clashes between wikis which share a common host.
*
* @return {string} localStorage item key
*/
getStoreKey: function () {
return 'MediaWikiModuleStore:' + mw.config.get( 'wgDBname' );
},
/**
* Get a key on which to vary the module cache.
*
* @return {string} String of concatenated vary conditions.
*/
getVary: function () {
return mw.config.get( 'skin' ) + ':' +
mw.config.get( 'wgResourceLoaderStorageVersion' ) + ':' +
mw.config.get( 'wgUserLanguage' );
},
/**
* Initialize the store.
*
* Retrieves store from localStorage and (if successfully retrieved) decoding
* the stored JSON value to a plain object.
*
* The try / catch block is used for JSON & localStorage feature detection.
* See the in-line documentation for Modernizr's localStorage feature detection
* code for a full account of why we need a try / catch:
* <https://github.com/Modernizr/Modernizr/blob/v2.7.1/modernizr.js#L771-L796>.
*/
init: function () {
var raw, data;
if ( this.enabled !== null ) {
// Init already ran
return;
}
if (
// Disabled because localStorage quotas are tight and (in Firefox's case)
// shared by multiple origins.
// See T66721, and <https://bugzilla.mozilla.org/show_bug.cgi?id=1064466>.
/Firefox/.test( navigator.userAgent ) ||
// Disabled by configuration.
!mw.config.get( 'wgResourceLoaderStorageEnabled' )
) {
// Clear any previous store to free up space. (T66721)
this.clear();
this.enabled = false;
return;
}
if ( mw.config.get( 'debug' ) ) {
// Disable module store in debug mode
this.enabled = false;
return;
}
try {
// This a string we stored, or `null` if the key does not (yet) exist.
raw = localStorage.getItem( this.getStoreKey() );
// If we get here, localStorage is available; mark enabled
this.enabled = true;
// If null, JSON.parse() will cast to string and re-parse, still null.
data = JSON.parse( raw );
if ( data && typeof data.items === 'object' && data.vary === this.getVary() ) {
this.items = data.items;
return;
}
} catch ( e ) {
mw.trackError( 'resourceloader.exception', {
exception: e,
source: 'store-localstorage-init'
} );
}
// If we get here, one of four things happened:
//
// 1. localStorage did not contain our store key.
// This means `raw` is `null`, and we're on a fresh page view (cold cache).
// The store was enabled, and `items` starts fresh.
//
// 2. localStorage contained parseable data under our store key,
// but it's not applicable to our current context (see getVary).
// The store was enabled, and `items` starts fresh.
//
// 3. JSON.parse threw (localStorage contained corrupt data).
// This means `raw` contains a string.
// The store was enabled, and `items` starts fresh.
//
// 4. localStorage threw (disabled or otherwise unavailable).
// This means `raw` was never assigned.
// We will disable the store below.
if ( raw === undefined ) {
// localStorage failed; disable store
this.enabled = false;
}
},
/**
* Retrieve a module from the store and update cache hit stats.
*
* @param {string} module Module name
* @return {string|boolean} Module implementation or false if unavailable
*/
get: function ( module ) {
var key;
if ( !this.enabled ) {
return false;
}
key = getModuleKey( module );
if ( key in this.items ) {
this.stats.hits++;
return this.items[ key ];
}
this.stats.misses++;
return false;
},
/**
* Queue the name of a module that the next update should consider storing.
*
* @since 1.32
* @param {string} module Module name
*/
add: function ( module ) {
if ( !this.enabled ) {
return;
}
this.queue.push( module );
this.requestUpdate();
},
/**
* Add the contents of the named module to the in-memory store.
*
* This method does not guarantee that the module will be stored.
* Inspection of the module's meta data and size will ultimately decide that.
*
* This method is considered internal to mw.loader.store and must only
* be called if the store is enabled.
*
* @private
* @param {string} module Module name
*/
set: function ( module ) {
var key, args, src,
descriptor = mw.loader.moduleRegistry[ module ];
key = getModuleKey( module );
if (
// Already stored a copy of this exact version
key in this.items ||
// Module failed to load
!descriptor ||
descriptor.state !== 'ready' ||
// Unversioned, private, or site-/user-specific
!descriptor.version ||
descriptor.group === 'private' ||
descriptor.group === 'user' ||
// Partial descriptor
// (e.g. skipped module, or style module with state=ready)
[ descriptor.script, descriptor.style, descriptor.messages,
descriptor.templates ].indexOf( undefined ) !== -1
) {
// Decline to store
return;
}
try {
args = [
JSON.stringify( key ),
typeof descriptor.script === 'function' ?
String( descriptor.script ) :
JSON.stringify( descriptor.script ),
JSON.stringify( descriptor.style ),
JSON.stringify( descriptor.messages ),
JSON.stringify( descriptor.templates )
];
} catch ( e ) {
mw.trackError( 'resourceloader.exception', {
exception: e,
source: 'store-localstorage-json'
} );
return;
}
src = 'mw.loader.implement(' + args.join( ',' ) + ');';
if ( src.length > this.MODULE_SIZE_MAX ) {
return;
}
this.items[ key ] = src;
},
/**
* Iterate through the module store, removing any item that does not correspond
* (in name and version) to an item in the module registry.
*/
prune: function () {
var key, module;
for ( key in this.items ) {
module = key.slice( 0, key.indexOf( '@' ) );
if ( getModuleKey( module ) !== key ) {
this.stats.expired++;
delete this.items[ key ];
} else if ( this.items[ key ].length > this.MODULE_SIZE_MAX ) {
// This value predates the enforcement of a size limit on cached modules.
delete this.items[ key ];
}
}
},
/**
* Clear the entire module store right now.
*/
clear: function () {
this.items = {};
try {
localStorage.removeItem( this.getStoreKey() );
} catch ( e ) {}
},
/**
* Request a sync of the in-memory store back to persisted localStorage.
*
* This function debounces updates. The debouncing logic should account
* for the following factors:
*
* - Writing to localStorage is an expensive operation that must not happen
* during the critical path of initialising and executing module code.
* Instead, it should happen at a later time after modules have been given
* time and priority to do their thing first.
*
* - This method is called from mw.loader.store.add(), which will be called
* hundreds of times on a typical page, including within the same call-stack
* and eventloop-tick. This is because responses from load.php happen in
* batches. As such, we want to allow all modules from the same load.php
* response to be written to disk with a single flush, not many.
*
* - Repeatedly deleting and creating timers is non-trivial.
*
* - localStorage is shared by all pages from the same origin, if multiple
* pages are loaded with different module sets, the possibility exists that
* modules saved by one page will be clobbered by another. The impact of
* this is minor, it merely causes a less efficient cache use, and the
* problem would be corrected by subsequent page views.
*
* This method is considered internal to mw.loader.store and must only
* be called if the store is enabled.
*
* @private
* @method
*/
requestUpdate: ( function () {
var hasPendingWrites = false;
function flushWrites() {
var data, key;
// Remove anything from the in-memory store that came from previous page
// loads that no longer corresponds with current module names and versions.
mw.loader.store.prune();
// Process queued module names, serialise their contents to the in-memory store.
while ( mw.loader.store.queue.length ) {
mw.loader.store.set( mw.loader.store.queue.shift() );
}
key = mw.loader.store.getStoreKey();
try {
// Replacing the content of the module store might fail if the new
// contents would exceed the browser's localStorage size limit. To
// avoid clogging the browser with stale data, always remove the old
// value before attempting to set the new one.
localStorage.removeItem( key );
data = JSON.stringify( mw.loader.store );
localStorage.setItem( key, data );
} catch ( e ) {
mw.trackError( 'resourceloader.exception', {
exception: e,
source: 'store-localstorage-update'
} );
}
// Let the next call to requestUpdate() create a new timer.
hasPendingWrites = false;
}
function onTimeout() {
// Defer the actual write via requestIdleCallback
mw.requestIdleCallback( flushWrites );
}
return function () {
// On the first call to requestUpdate(), create a timer that
// waits at least two seconds, then calls onTimeout.
// The main purpose is to allow the current batch of load.php
// responses to complete before we do anything. This batch can
// trigger many hundreds of calls to requestUpdate().
if ( !hasPendingWrites ) {
hasPendingWrites = true;
setTimeout( onTimeout, 2000 );
}
};
}() )
}
};
}() ),
// Skeleton user object, extended by the 'mediawiki.user' module.
/**
* @class mw.user
* @singleton
*/
user: {
/**
* @property {mw.Map}
*/
options: new Map(),
/**
* @property {mw.Map}
*/
tokens: new Map()
},
// OOUI widgets specific to MediaWiki
widgets: {}
};
// Attach to window and globally alias
window.mw = window.mediaWiki = mw;
}() );
Mini Shell